Using K mesons to probe the evolution of the source at HIRFL-CSR energy
YIN Hongjie
CHEN Bowen
MENG Hanbing
Abstract：In high-energy heavy-ion collisions at HIRFL-CSR energies,the quark-gluon plasma may be generated.By utilizing K mesons as probes,early-stage evolution information of the particle emission source can be inferred.We model the expansion dynamics of the particle emission source at HIRFL-CSR energies using(2+1)-dimensional hydrodynamic equations derived from conservation laws.To generalize the framework,the original three conservation equations are reformulated into five equations through the introduction of the metric tensor and Christoffel symbols.These equations are numerically solved via the operator-splitting method.For the evolution of the source,three scenarios are investigated:the chemical freeze-out,partial chemical equilibrium,and thermal freeze-out models.Each model is tested with distinct initial configurations of transverse and longitudinal radii,including cases where the transverse radius equals,exceeds,or is smaller than the longitudinal radius.We analyze the energy density profiles and transverse/longitudinal velocity distributions across all models.Our results demonstrate that when the initial transverse radius is larger than the longitudinal radius,the central density of the source undergoes the most rapid evolution.
Keywords：evolution of sourceheavy ion collisionsHIRFL-CSR energy
Publication Date：2025-06-15
Online Publishing Date：2025-09-09(First online date of this platform, not the publication date of the document)
Pages：8( 126-133 )